Reversing and braking mechanism for machine tools



a 2 g n 7 W. T. EMMES REVERSING AND BRAKING MECHANISM FOR MACKINE TOOLS 2 sheets-sheet 1 Original Filed April 16, 1924 A. 7, 192, LfifiQJMl w. T. EMMES REVERSING AND BRAKING MECHANISM FOR MACHINE TOQLS Ofiginal Filed April 16, 1924 2 Sheets-Sheet 2 (O6 IQ4- men as my 97 imam Patented Aug. 7, 1928.

"UNETED srarss earner easier...

,wILLIAM 'r. ElIIMES, or CINCINNATI, euro.

inclusive. 1 40 REvEasr G AND BRAKING MECHANISM non MACHINE TOOLS.

Original application filed April- 16, 1924, Serial No. ?07,004. Divided and this application fiYed October 4, 1924. Serial No 741,599;

The invention described herein is divif sional of the application filed by me upon April 16, 1924, under Serial No. 707,004, and entitled"Change speed and reversing mechanism for machine tools. .In the in vention to be described, the reversing and braking features have'been set forth'separately.

An object'of this invention is to produce a reversing andbraking mechanism which will be adaptable to any type of-inachine .tool in which reversing and braking mechpanying drawings, inwhich:

. Fig. 1 1s a sectional elevation of a brak- Fig. 2, but

tive view of details of the feature of my invention I have disclosed in Figs lto 4 The mechanism is housed in a casing 89 which contains the bearings for the drive shaft 28 which receives its power from drive pulley 104. At times during the operation of the mechanism it may be desirable to check or brake the speed of the mechanism, but at other times it may be necessary to bring about a reversed rotation of the drive shaft 28. The device fOr bringing about such a reversal may be. embodied in the portion of the mechanism'lying within casing 89 and operatively connected with the drive .pulley. This feature. of my invention I have illustrated fully in Figs. 1 to 5 inclusive. Drive pulley 104 of this feature of my invention is keyed upon the hub ofa secondary pinion 105.

118 (see Fig. 2). carry small elongated pinions 119 and 120 the parts in relatively different pinion 105.

This pinion is rotatably mounted on the hub of a primary pinion 106 which is keyed, as shown in Fig. 1, on the drive shaft 28.. Drive pulley 104 belowits rim is provided with a brake drum 107 within which an expanding brake band elem'ent 108 is mounted. The elongated hub 109 of this expanding brake band is rotatably mounted on'drive shaft 28 and has splined for slidable engagement upon its outer surface a double ended cone, the forward end 110 of which engages and is adapted to operate an arm 111 which is connected with a key 112 adapted to expand the brake band element 108. The opposite end of the double cone member is provided with cone 113 which will engage the walls of a recess 114 in order that the brake band element, after it is disengaged from drum 107 may be prevented from rotating. Within brake band element- 108, I have provided a somewhat planetary gear system consisting of a series of spindles 115, 116, 117, and Spindles 115 and 117 rotatably mounted thereon. The width of the teeth of these small elongated pinions is equal to that of the combined widths of the pinions 105 and 106, and the teeth of pinions 119 and 120 engage at one end with the teeth of pinion 106. r The large pinions 121 and 122 are mounted upon spindles 1 16. and 118 and have theirteeth in mesh with the opposite end of the teeth of pinions 119 and 120 as well as in mesh with the teeth of Thus it will be seen that when the brake band 108 is expanded, the drive pulley 104 will become rigidly connected With brake band element 108 and because of this and the prevention of the relative rotation'of the pinions thereby, will opera tively connectthe drive pulley 104 with drive shaft 28 so that direct driving connection between the pulley and the shaft is es tablished. However, when cone 113 is movedto engage recess 114 (see Fig. 1) brake band 108 will be contracted, as shown in Fig. 2, to disconnect pulley 104 from shaft 28. Upon engagement of conellS "with recess 114 (see Fig. 1) the brake band differential pinions 121 and 122 as well as differential pinions 119 and 120, so that pinments until the reversing mechanism ion 106 will be caused to rotate in an opposite direction to that of its drivmg pmlon 105. This then creates a reversing mechanism which will cause reverse rotation of,

the drive shaft 28. 1

The cooperation of the braking mechanism, disclosed in Fig. 1, with the drive shaft 28, is readily understood, inasmuch as the position of the double cone member 110v and 113, will govern the driving connection of pulley 10-1 with the m chanism or will bring about a braking action to stop the inertia of movement ofthe rotating eledisclosed inFig. 1 will have been brought into direct connection with pulley 10L and spinj said shaft, a secondary hubbed gear iota-tively mounting the hub portion of the primary gear, a pulley and below the rim thereof a brake drum, said pulley by means of its hub portion mounting and being fastened to the hub portion of the secondary gear, an expanding brake band element with an elongated huh rotatively mounted on the other end of the drive shaft, said brake band eleine'ntvbeing aligned for engagement with the inner portion of the brake drum, an arm to expand the brake band element, and a double ended cone mounted in splined engagement on the elongatedhub portion of the brake band elements, with means adapted to move thecone to bring one end thereof into engagement with a recessin the wall of the casing to prevent'rotation of the coneor tomove the cone to bring its other ,end for operation of the arm to a position for expanding the brake band -element,"and a planetary gear system mounted 011 the brake band element adapted to cause-reverse rotation of the shaft and comprising small elongated gears, and short largegears with one end of each elongated gear engage one of the short large gears, the latter gears engaging with the secondary gear. V p a I 2. A reversing and braking mechanism comprising a drive shaftin the bearings of a stationary casing, a primary hubb-ed gear mounted and fastened to and on one end of said shaft, asecondary hubbed gear rotatively mounting the hub portion of the primary thereof engaging the' primary gear, while the other ends thereof gear, a pulley and below the rim" thereof a brake drum, said pulley by means of its .hubportion mounting and being fastened to the hub portion of the secondary gear, an

expanding brake band element with an elongated hub rotativ-ely mounted'on the other end of the drive-shaft, said brake band element being aligned for. engagement with the inner portion of the brake band, an arm to expand the brakeband'element, and a double ended co'n'e mounted in splined engagement on the elongated hub portion of the brake band element, with means adapted to move the cone to brin'gone end thereof the casing to prevent rotation of the cone or to move the cone to bring'its other end forop-eration of the armeto a position for-expanding the brake band element, and a planetarygear systemmounted on the brakeband element adapted to 'causereverse rotation of the shaft and comprising elongated gears and short gears, with one end of each elongated gear, engaging the primary gear,

the opposite end of each-elongated gear engaging one of the short gears, the short gears engaging the secondary gear. v

3. A reversing and braking mechanism comprising a dr1ve shaft in the bearings of a into engagement wi'th-a-recess in the wall of stationary casing, a primary hubbed gear mounted'on and fastened to one end of said shaft, a secondary hubbed gear rotatively 'mounting the hub portion-of the primary gear, a pulley and vwithin the pulley rim a hollow brake drum, said pulley by' 'means of 1ts 'hub portion 11101111 51111} and being fastened'to the'hub -portion' of the secondary gear, a hollow expanding brake band element with an elongated hub rotatively mounted on the other end of the drive shaft, said brake band. element being aligned for engagement with the inside surface of the brake drum, an arm to expand the brake band element, anda double ended cone sp'l'inded for'reciprocation on the elongated hubof the bralre band element, with means adapted to move the cone-to bring one end thereof into engagement with a recess in the wall of the casing to prevent rotation of the concerto move 7 the con'e to bring-its otherendfor operation of the arm to a position to ezgpand the'brake band element, and a planetary gearsystem mounted within and on the hollow brake band element,adapted to cause reverse rotation ofthe shaft, and'comprising small gears and large gears, with one. end of each of the smallfgears engaging the primary gear, the opposite end of each small gear engaging oneof the large, gears, the large gears engaging the secondary gear.- 7

"In w tness whereof, I afiix my signature.

fwnirirair T. 12mins. 

